A measurement of the K+ → π+μ+μ− decay

Eduardo Cortina, A. Kleimenova, Elisa Minucci, S. Padolski, P. Petrov, A. T. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe

91 more authors

V. W. S. Wong, Douglas A. Bryman, Jie Ying Fu, Tomáš Husek, J. Jerhot, Karol Kampf, Michal Zamkovský, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, Letizia Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, Fabrizio Petrucci, H. Wahl, Angelo Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, GAIA LANFRANCHI, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, Fabio Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, Marco Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, Roberto Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, Monica Pepe, Mauro Piccini, Flavio Costantini, L. Di Lella, N. Doble, M. A. Giorgi, Silvia Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, Franco Spinella, I. Mannelli, G. D’Agostini, Mauro Raggi, A. Biagioni, Paolo Cretaro, Ottorino Frezza, E. Leonardi, A. Lonardo, M. Turisini, Paolo Valente, P. Vicini, R. Ammendola, Vincenzo Bonaiuto, A. Fucci, Andrea Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, G. P. Heath

Journal of High Energy Physics, 2022

Full text Open access: Gold Metadata (CSL-JSON)

DOI 10.1007/jhep11(2022)011

Data confidence 85 high

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Abstract

Abstract A sample of 2.8 × 104K+ → π+μ+μ− candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) × 10−8, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at $$ \mathcal{O} $$ O (p6).